EP1832013A1 - Verfahren zur nachrichten]bertragung per funk unter verwendung eines repeaters - Google Patents
Verfahren zur nachrichten]bertragung per funk unter verwendung eines repeatersInfo
- Publication number
- EP1832013A1 EP1832013A1 EP05815601A EP05815601A EP1832013A1 EP 1832013 A1 EP1832013 A1 EP 1832013A1 EP 05815601 A EP05815601 A EP 05815601A EP 05815601 A EP05815601 A EP 05815601A EP 1832013 A1 EP1832013 A1 EP 1832013A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- message
- radio
- receiver
- transmitter
- access point
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15592—Adapting at the relay station communication parameters for supporting cooperative relaying, i.e. transmission of the same data via direct - and relayed path
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0032—Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
Definitions
- the invention relates to a method and a transmitter for transmitting a message by radio from a transmitter to a receiver, wherein the transmitter sends the message to a radio station for message forwarding.
- messages for example with voice information, image information, video information, SMS (Short Message Service), multimedia messaging service (MMS) or other data, are transmitted by means of electromagnetic waves over a radio interface between transmitting and receiving radio station.
- the radio stations may be various subscriber-side radio stations or network-side radio devices such as repeaters or radio access points such as base stations.
- the subscriber-side radio stations are mobile radio stations.
- the radiation of the electromagnetic waves takes place at carrier frequencies which lie in the frequency band provided for the respective system.
- Mobile communication systems are often referred to as cellular systems such.
- B. according to the standard GSM (Global System for Mobile Communication) or UMTS (Universal Mobile Telecommunications System) with a network infrastructure consisting of e.g. B. formed from base stations, facilities for controlling and controlling the base stations and other network-side facilities.
- GSM Global System for Mobile Communication
- UMTS Universal Mobile Telecommunications System
- WLANs Wireless Local Area Networks
- Examples of different Standards for WLANs are HiperLAN, DECT, IEEE 802.11, Bluetooth and WATM.
- Radio stations can only communicate directly with one another if they are both in the radio coverage area of the other radio station. Is a direct communication not possible resp. Due to the distance between the radio stations only with poor quality possible, so messages between these radio stations on other radio stations, which - by forwarding the messages - as
- Relay radio stations or repeaters act, be transmitted. Such message forwarding can, depending on the specific embodiment of the radio communication system, be carried out both by subscriber radio stations and by network radio stations. Messages can, for example, in a WLAN between a radio access point and ⁇ merfunkstationen are forwarded far from the radio access point remote partici. Even in an ad hoc mode of a radio communication system, subscriber radio stations can communicate with one another via one or more hops (hop or multi-hop) without the need for switching devices such.
- B. Base stations or radio access points are interposed.
- the invention has for its object to provide a method for
- the transmitter is preferably a network-side radio station, such.
- B a base station or a radio access point of a local radio communication system, wherein the receiver may be a subscriber station.
- the recipient does not have to be the final recipient of the message; he may be able to forward the received message if necessary.
- the forwarding station is used to forward radio messages, so it can be mobile or stationary, network side or subscriber side.
- the message is transmitted simultaneously in time from the sender to the receiver and from the forwarding station to the receiver. This can be realized in that the message will be sent simultaneously by the transmitter and the forwarding station, or time-shifted relative to each other.
- the sender receives a second message before the first step, in particular a pilot message known to the sender, on the one hand directly from the receiver and on the other hand from the forwarding station which has previously received the second message from the receiver.
- the method step according to this development can be carried out before each message transmission according to the first step. However, it is also possible that the method step according to this development is used for several message transmissions according to the first step.
- the two receptions of the second message by the transmitter are preferably sequential, not simultaneous.
- the receiver, the second message by a single verses ⁇ dung to both the transmitter and also send to the relay station, whereupon the relay station forwards the second message to the sender.
- a channel estimate is made using the two-way received message.
- the channel estimation is preferably performed by the transmitter. It relates to the radio ⁇ channel between the receiver and the transmitter, in which radio channel message forwarding is included by the relay station.
- the transmitter performs prior to the message transmission of the first step, a processing of the message using a result of the channel contemptuous ⁇ by wetting.
- the transmitter can for example use his gained from the channel estimation knowledge of the radio channel to the so-ren the message containing signals to verzer ⁇ that during the transfer to the recipient of the radio channel cancels out the distortion so that the receiver a signal ho ⁇ ago Quality reached .
- the receiver can dispense with its own channel estimation for equalization of the received signal.
- the processing of the message takes place in the context of a joint transmission method.
- the transmitter is received so that the signal intended for it with good quality of the respective receiver takes into account the mutual Beeinflus ⁇ solution different from it to various recipients of transmitted signals, thereby the mutual destructive Interfe ⁇ rence to decrease.
- the transmitter sends the receiver information about the channel estimate that has been made. This may be used such that, after receiving the message, the receiver performs processing on the message using a channel estimation result.
- the processing of the message by the receiver using a result of the transmitter-side channel estimation may alternatively or in addition to the transmitter-side processing of the message take place using a result of the channel estimation.
- the transmitter according to the invention has means for sending a message in a first step to a forwarding station, and means for sending the message subsequently in a second step to a receiver so that the message reaches the receiver in parallel with the time the forwarding station sent message to the recipient.
- the transmitter according to the invention is particularly suitable for carrying out the method according to the invention, and this may also apply to the embodiments and further developments. For this purpose, he may have other suitable means.
- FIG. 1 shows a first step of the method according to the invention
- FIG. 2 shows a second step of the method according to the invention
- FIG. 3 shows a third step of the method according to the invention
- FIG. 4 a fourth step of the method according to the invention.
- a radio communication system comprising a subscriber station MT (MT: Mobile Terminal), a radio access point AP (AP: Access Point) and a repeater REP.
- MT Subscriber station
- AP Access Point
- REP repeater REP.
- Repeaters are radio stations, which serve the forwarding of messages described z. B. in
- Repeaters are u. a. used to reduce the infrastructure costs of the radio communication system.
- the density of radio access points which is depending on the type of the considered Funkkommunikati- onssystems at the radio access points, for example, Ba ⁇ sisstationen of cellular systems or can be, radio access points of local networks can be reduced.
- the repeaters increase the radio coverage area of the radio access points by forwarding messages from and / or to the radio access points.
- the extent of the repeater-side processing of the messages to be forwarded may be different in the context of the present invention, it is for. B. possible that no processing takes place, d. H .
- the considered repeater REP is an "amplify and forward" or transparent repeater.
- the inventive method is divided into two phases: at the beginning of a message transmission takes place in the upward direction, d. H . from the subscriber station MT to the radio access point AP, shown in FIGS. 1 and 2, and subsequently a message transmission takes place in the downlink direction, ie. H . from the radio access point AP to the minista ⁇ tion MT, shown in Figures 3 and 4.
- the subscriber station MT sends a pilot message PILOT.
- 1 to 4 transmitted signals by the Letter B ⁇ ben s and signals received by the book days e ⁇ attached shows.
- the subscriber station MT sends the pilot message PILOT in the form of the signal s M.
- the pilot PILOT access point is in the form of the signal e and R from the radio ⁇ AP in the form of the signal e A ⁇ received.
- the radio channel for the message transmission from the subscriber station MT to the radio access point AP is denoted by H MA , the ⁇ that for the message transmission from the subscriber station MT to the repeater REP with H MR .
- the repeater REP sends the pilot message PILOT in the form of the signal s R.
- the radio channel for the message transmission from the repeater REP to the radio access point AP is H EA be ⁇ draws.
- the pilot message PILOT is received in the form of the signal e A 2 .
- the radio access point AP is the signal sent from the subscriber station s M known, since this is the pilot ⁇ message PILOT.
- the radio access point AP carries out the channel estimation on the two received signals e A ⁇ and e A 2 and thus determines the overall channel matrix H for the radio channel between the subscriber station MT and the radio access point AP in the upward direction with respect to the described transmission method .
- the following is a message MESSAGE from the radio access point AP to be transmitted to the subscriber station MT.
- the sent radio access point AP in a first procedural ⁇ rensuze in the downward direction shown in Figure 3, which receives the MESSAGE message in the form of the signal S A 1 to the repeater REP message MESSAGE in the form of the signal e R.
- the radio channel for the transmission of messages from the radio access point AP to the repeater REP is distinguished be with H R ⁇ T ⁇ , wherein it is in the matrix H T R ⁇ the Transpose Matrix ned H R ⁇ .
- the message MESSAGE in the form of the signal s A 2 sent from the radio access point AP to the subscriber station MT is designated H MA T , where the matrix H MA T is the transposed matrix H m .
- Pa ⁇ rallel for transmitting the message MESSAGE from the Funkzu- starting point AP to the subscriber station MT is the message MESSAGE also from the Repeatpr RFP to the subscriber station MT transmit, wherein the repeater REP sends the signal s R.
- the radio channel for the message transmission from the repeater REP to the subscriber station MT is designated H MR T , wherein the matrix H MR T is the transposed matrix H MR .
- the parallel transmission is performed by the radio access ⁇ starting point AP and the repeater REP, the message MESSAGE at the same time or even against each ship slightly shifted in time so that the subscriber station MT starts a superposition of two messages MESSAGE in the form of the signal e M recom-.
- the size of the permissible displacement is u. a. from the channel impulse response and is known to the radio access point AP due to the previously performed channel estimation.
- the shift should be such that the two messages MESSAGE are received by the subscriber station MT in the same OFDM symbol. As long as the guard period between two adjacent OFDM symbols is large enough, the displacement ⁇ can be dispensed bung an explicit determination.
- the total channel matrix H ⁇ for the downlink with respect to the described transmission method is the transposed overall channel matrix H for the uplink, assuming that the transmission frequencies for uplink and downlink match.
- the message is sent twice by the radio access point AP for a message transmission from the radio access point AP to the probationsta ⁇ tion MT.
- the repeater REP for a message transmission from the radio access point AP to the subscriber station MT, only a simple transmission of the message by the radio access point AP is carried out, which is then forwarded by the repeater REP to the subscriber station.
- the reciprocity of the uplink and downlink channels may be used to pre-distort the radio access point AP before the two transmissions of the message, so that an equalization of the superimposed message received from the subscriber station can be omitted.
- the radio access point AP uses the gewonnne channel estimation result direction from him because of the process steps in the up ⁇ . This results represent ⁇ in that the subscriber stations of the radio communication system can be easily fitted. Because the effort of the subscriber stations for the channel estimation can fail, the signal evaluation in the subscriber stations can proceed more quickly.
- the predistortion of the messages sent by the radio access point AP is performed in such a way that that the changes of the transmitted signal caused by the radio channel are "inverse anticipated", so that the receiver achieves a nearly unaltered signal.This can be done simultaneously with respect to several subscriber stations, so that the receiver takes into account the mutual interference of the signals sent to different receivers ⁇ Untitled (joint transmission).
- the invention can also be applied to the case of several transmitting and receiving antennas at the transmitter and / or at the Receiver are used (MIMO: Multiple Input Multiple Output). Additionally or al ternatively ⁇ it is applicable to the case where not only a repeater, but a plurality of repeaters or the messages in parallel from or to the radio access point AP. forward the subscriber station MT. This leads in particular
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Relay Systems (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102004061342A DE102004061342B3 (de) | 2004-12-20 | 2004-12-20 | Verfahren zur Nachrichtenübertragung per Funk unter Verwendung eines Repeaters |
PCT/EP2005/056201 WO2006067019A1 (de) | 2004-12-20 | 2005-11-24 | Verfahren zur nachrichtenübertragung per funk unter verwendung eines repeaters |
Publications (1)
Publication Number | Publication Date |
---|---|
EP1832013A1 true EP1832013A1 (de) | 2007-09-12 |
Family
ID=35999503
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05815601A Withdrawn EP1832013A1 (de) | 2004-12-20 | 2005-11-24 | Verfahren zur nachrichten]bertragung per funk unter verwendung eines repeaters |
Country Status (6)
Country | Link |
---|---|
US (1) | US7751775B2 (de) |
EP (1) | EP1832013A1 (de) |
KR (1) | KR20070087654A (de) |
CN (1) | CN101133569B (de) |
DE (1) | DE102004061342B3 (de) |
WO (1) | WO2006067019A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8396368B2 (en) | 2009-12-09 | 2013-03-12 | Andrew Llc | Distributed antenna system for MIMO signals |
IT1403065B1 (it) | 2010-12-01 | 2013-10-04 | Andrew Wireless Systems Gmbh | Distributed antenna system for mimo signals. |
DE102005049103A1 (de) * | 2005-10-13 | 2007-04-19 | Siemens Ag | Funkkommunikation mit einem Repeater |
WO2009108116A1 (en) * | 2008-02-25 | 2009-09-03 | Chalmers Intellectual Property Rights Ab | Relays in multi-user mimo systems |
IT1398025B1 (it) | 2010-02-12 | 2013-02-07 | Andrew Llc | Distributed antenna system for mimo communications. |
US8838706B2 (en) * | 2010-06-24 | 2014-09-16 | Microsoft Corporation | WiFi proximity messaging |
EP3506521A1 (de) | 2010-10-01 | 2019-07-03 | CommScope Technologies LLC | Verteiltes antennensystem für mimo-signale |
CN105611648B (zh) * | 2011-12-23 | 2018-04-10 | 华为技术有限公司 | 一种无线中继设备的中继方法及无线中继设备 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7558557B1 (en) * | 1991-11-12 | 2009-07-07 | Broadcom Corporation | Low-power messaging in a network supporting roaming terminals |
MXPA05012228A (es) * | 2003-05-28 | 2006-02-10 | Ericsson Telefon Ab L M | Metodo y sistema para las redes de comunicaciones inalambricas utilizando retransmision. |
SE0303602D0 (sv) * | 2003-12-30 | 2003-12-30 | Ericsson Telefon Ab L M | Method and arrangement in self-organizing cooperative network |
-
2004
- 2004-12-20 DE DE102004061342A patent/DE102004061342B3/de not_active Expired - Fee Related
-
2005
- 2005-11-24 US US11/793,503 patent/US7751775B2/en active Active
- 2005-11-24 WO PCT/EP2005/056201 patent/WO2006067019A1/de active Application Filing
- 2005-11-24 CN CN2005800437262A patent/CN101133569B/zh not_active Expired - Fee Related
- 2005-11-24 EP EP05815601A patent/EP1832013A1/de not_active Withdrawn
- 2005-11-24 KR KR1020077016085A patent/KR20070087654A/ko not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2006067019A1 * |
Also Published As
Publication number | Publication date |
---|---|
US7751775B2 (en) | 2010-07-06 |
WO2006067019A1 (de) | 2006-06-29 |
DE102004061342B3 (de) | 2006-05-11 |
CN101133569A (zh) | 2008-02-27 |
CN101133569B (zh) | 2011-11-23 |
US20080261518A1 (en) | 2008-10-23 |
KR20070087654A (ko) | 2007-08-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2007042384A1 (de) | Funkkommunikation mit einem repeater | |
EP1832013A1 (de) | Verfahren zur nachrichten]bertragung per funk unter verwendung eines repeaters | |
US8761074B2 (en) | Relay backhaul in wireless communication | |
DE69620574T2 (de) | Synchronierung einer nachrichtenübertragungsverbindung in einem mobilen übertragungssystem | |
EP2091298B1 (de) | FDD-Inband-Rückverbindung und Verfahren | |
CN102265651A (zh) | 无线通信*** | |
DE19733336A1 (de) | Verfahren und Funkstation zur Datenübertragung | |
EP1720369A1 (de) | Funkkommunikation mit OFDMA und IFDMA | |
DE112016007285T5 (de) | Kommunikationsverfahren und -system | |
DE10027115B4 (de) | Verfahren zur Signalübertragung und Funk-Kommunikationssystem dafür | |
DE102005023322A1 (de) | Funkkommunikation unter Verwendung von Relays | |
EP1849243B1 (de) | Sender- und empfängerseitige bearbeitung von mit einer smart antenna abgestrahlten bzw. empfangenen signalen | |
CN102487294B (zh) | 中继通信方法和中继站 | |
DE102004024647A1 (de) | Verfahren und Funkstation zur Regulierung von Zugriffsraten in einem Funkkommunikationssystem | |
EP1681792B1 (de) | Gesicherte Nachrichtenübertragung in einem Multi-Hop System | |
EP2245761B1 (de) | Weiterleitungsknoten und endgerät für ein fdd-kommunikationsnetzwerk und verfahren diese zu betreiben | |
EP1919236B1 (de) | Weiterleitung von Nutz- und Kontrollinformationen beim Soft Handover | |
WO2008043757A1 (de) | Ofdm kommunikationssystem mit schnellen frequenzsprüngen | |
WO1999060707A2 (de) | Verfahren und basisstation zur signalübertragung in einem organisationskanal eines funk-kommunikationssystems | |
CN103078726B (zh) | 中继传输的方法及设备 | |
EP1915004A1 (de) | Systemübergreifender Aufwärtskanal für die Funkkommunikation | |
DE19829818A1 (de) | Verfahren zur Datenübertragung | |
DE19810813A1 (de) | Verfahren und Funk-Kommunikationssystem zur Datenübertragung | |
EP1914921A1 (de) | Wiederholte Nachrichtenübertragung in einem Multihop-Funkkommunikationssystem | |
CN106374982A (zh) | 一种信号传输方法及*** |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20070720 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA SIEMENS NETWORKS S.P.A. |
|
DAX | Request for extension of the european patent (deleted) | ||
RAP3 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: NOKIA SIEMENS NETWORKS GMBH & CO. KG |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 20080327 |